Electromagnetic shielding rooms are used to isolate the electromagnetic environment inside and outside the room. They can prevent external electromagnetic interference from entering the room and affecting the testing and operation of indoor equipment, and also limit the electromagnetic leakage of high-power high-frequency equipment indoors to prevent affecting the normal operation of surrounding equipment. In layman's terms, a shielding room is just a large iron box. It utilizes the principle of shielding to create a hexahedral room made of metal materials, confining electromagnetic waves within a certain spatial range so that the energy of the electromagnetic field from one face to another is greatly attenuated, thus providing the shielding effect of the shielding room.HBTE shielding rooms can be further divided into shielding rooms and anechoic chambers. Shielding rooms, according to the usage scenarios, can be divided into conventional shielding rooms, signal coverage shielding rooms, and conduction testing shielding rooms. Anechoic chambers, according to usage scenarios, can be divided into millimeter wave anechoic chambers, compact field anechoic chambers, Wi-Fi testing anechoic chambers, OTA anechoic chambers, and EMC electromagnetic wave anechoic chambers, etc.